Update the background image and styles for the Welcome Panel. This iteration does not use different colors on the admin color schemes, so the CSS for that has been removed. This also adds back in a working "Edit styles" link, which was removed in 6.2 because the link was broken.
Props richtabor, markoserb.
Fixes#58545.
Built from https://develop.svn.wordpress.org/trunk@56291
git-svn-id: http://core.svn.wordpress.org/trunk@55803 1a063a9b-81f0-0310-95a4-ce76da25c4cd
Remove the green background from the "dot" accent, to prevent low contrast for the dismiss button. Use menu colors for the background on alternate color schemes. Remove the "Edit styles" link as there is no longer a direct link to the global styles section of the site editor.
Follow-up to [55451].
Props sabernhardt, ryokuhi, laurlittle, richtabor.
Fixes#57759.
Built from https://develop.svn.wordpress.org/trunk@55574
git-svn-id: http://core.svn.wordpress.org/trunk@55086 1a063a9b-81f0-0310-95a4-ce76da25c4cd
ryelle